#include <iostream>
#include <string>
using namespace std;

int main() {
  string s1 = "hello";
  string s2 = "hello";
  string s3 = "xello";
  string s4 = "aello";
  if (s1.compare(s2) == 0) {
    cout << "s1 == s2" << endl;
  }

  if (s1.compare(s3) < 0) {
    cout << "s1 < s3" << endl;
  }

  if (s1.compare(s4) > 0) {
    cout << "s1 > s4" << endl;
  }

  return 0;
}